* {
  margin: 0;
  padding: 0;
}
.game_title {
  text-align: center;
  white-space: nowrap;
  font-size: 24px;
  color: #2c3e50;
  font-weight: bold;
  line-height: 34px;
  margin: 15px 0;
}
.game_rule {
  position: fixed;
  left: 30px;
  bottom: 50px;
  width: 160px;
}
#game {
  width: 600px;
  height: 600px;
  margin: 0 auto;
}
#game .block {
  float: left;
  box-sizing: border-box;
  width: 25%;
  height: 25%;
  background: #f0f0f0;
  border: 2px solid #ddd;
  cursor: pointer;
}
#game .block:hover {
  background: #2b84e0;
}
#game .block .pic {
  width: 100%;
  height: 100%;
  background: url(../images/1.png) no-repeat center center;
  transform: scaleX(0);
  transition: transform 0.2s;
}
#game .block.on .pic {
  transform: scaleX(1);
}
#game .block.done {
  background-color: #a5adb4;
}
.level_box {
  position: fixed;
  bottom: 50px;
  right: 30px;
  width: 160px;
}
.level_box p {
  font-size: 14px;
  margin: 10px 0;
}
.level_box p span {
  color: red;
}
.level_box #level_select {
  outline: none;
  width: 100%;
  height: 30px;
  margin-bottom: 10px;
  padding: 0 8px;
  box-sizing: border-box;
  appearance: none;
  background: url(../images/arrow_down.png) no-repeat right center #fff;
  user-select: none;
}
.level_box .new_game {
  width: 100%;
  height: 36px;
  font-size: 14px;
  outline: none;
  border-radius: 5px;
  box-sizing: border-box;
  cursor: pointer;
  border: 3px solid #2b84d0;
  background-color: #2b84d0;
  color: #fff;
}
.level_box .new_game:hover {
  background-color: #fff;
  color: #2b84d0;
}
